///*
// * Copyright 2002-2020 the original author or authors.
// *
// * Licensed under the Apache License, Version 2.0 (the "License");
// * you may not use this file except in compliance with the License.
// * You may obtain a copy of the License at
// *
// *      https://www.apache.org/licenses/LICENSE-2.0
// *
// * Unless required by applicable law or agreed to in writing, software
// * distributed under the License is distributed on an "AS IS" BASIS,
// * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// * See the License for the specific language governing permissions and
// * limitations under the License.
// */
//
//package org.springframework.core.metrics.jfr;
//
//import java.util.ArrayDeque;
//import java.util.Deque;
//
//import org.springframework.core.metrics.ApplicationStartup;
//import org.springframework.core.metrics.StartupStep;
//
///**
// * {@link ApplicationStartup} implementation for the Java Flight Recorder.
// * <p>This variant records {@link StartupStep} as Flight Recorder events; because such events
// * only support base types, the {@link StartupStep.Tags} are serialized as a single String attribute.
// * <p>Once this is configured on the application context, you can record data by launching the application
// * with recording enabled: {@code java -XX:StartFlightRecording:filename=recording.jfr,duration=10s -jar app.jar}.
// *
// * @author Brian Clozel
// * @since 5.3
// */
//public class FlightRecorderApplicationStartup implements ApplicationStartup {
//
//	private long currentSequenceId;
//
//	private final Deque<Long> currentSteps;
//
//
//	public FlightRecorderApplicationStartup() {
//		this.currentSequenceId = 0;
//		this.currentSteps = new ArrayDeque<>();
//		this.currentSteps.offerFirst(0L);
//	}
//
//
//	@Override
//	public StartupStep start(String name) {
//		FlightRecorderStartupStep step = new FlightRecorderStartupStep(++this.currentSequenceId, name,
//				this.currentSteps.getFirst(), committedStep -> this.currentSteps.removeFirst());
//		this.currentSteps.offerFirst(this.currentSequenceId);
//		return step;
//	}
//
//}
